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Abstract

This article describes an algorithm for converting a resolution of an original image by comparing the gray levels of picture elements (pels) of the original image with the plural dither matrices to generate binary data which result from the comparison and determining the number of black and white pels in the converted image. Fig. 1 shows an original image 1, dither matrices 2, 3 and 4, resultant binary data 5, 6 and 7, and a converted image 8. The values in the original image 1 and the dither matrices 2, 3, and 4 are represented by hexadecimal notation (X). For example, the value X'65' at a pel position (2, 2) in the original image 1 means the binary value '01100101'. As shown in Fig. 2, gray levels between a real white level and a real black level are divided into 256 levels. Fig.

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Conversion of Image Resolution

This article describes an algorithm for converting a resolution
of an original image by comparing the gray levels of picture elements
(pels) of the original image with the plural dither matrices to
generate binary data which result from the comparison and determining
the number of black and white pels in the converted image. Fig. 1
shows an original image 1, dither matrices 2, 3 and 4, resultant
binary data 5, 6 and 7, and a converted image 8. The values in the
original image 1 and the dither matrices 2, 3, and 4 are represented
by hexadecimal notation (X). For example, the value X'65' at a pel
position (2, 2) in the original image 1 means the binary value
'01100101'. As shown in Fig. 2, gray levels between a real white
level and a real black level are divided into 256 levels. Fig. 2 also
shows the ranges covered by the dither matrices 2, 3 and 4.

(Image Omitted)

It is assumed that 4x4 pels of the
original image, as surrounded by a thick line, are being processed to
generate the converted or double resolution image 8. The gray level
values of the pels in the original image 1 are compared with the
threshold values of the dither matrices 2, 3 and 4 to generate the
binary values 5, 6 and 7, respectively. For example, the gray value
X'10' at the pel position (1, 1) of the original image 1 is
sequentially compared with the threshold values X'CO' of the dither
matrix 2, X'CO' of the dither matrix 3 and X'EO' of the dither matrix
4, whereby the binary data 1, 1 and 1 are generated, as shown by
circles in Fig. l. In the comparison,...